The drug is available in one- to five-milligram tablets and sold in Canada under the names, Propecia and Proscar, as well as generic labels.

The drug has been updated to include information about the potential risk of male breast cancer.

Most of the reports have been associated with the five-milligram tablets, according to a Health Canada statement released Thursday.

"Based on the currently available evidence, it is not known with certainty whether Finasteride can cause breast cancer, nor can this possibility be ruled out at this point in time," read the statement.

Patients are encouraged to report any concerns to their doctors. Changes experienced might include breast enlargement, lumps, tenderness, pain or nipple discharge.

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